結果

問題 No.1254 補強への架け橋
ユーザー marroncastlemarroncastle
提出日時 2020-11-26 03:28:28
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 301 ms / 2,000 ms
コード長 2,082 bytes
コンパイル時間 609 ms
コンパイル使用メモリ 82,288 KB
実行使用メモリ 105,076 KB
最終ジャッジ日時 2024-07-23 20:39:56
合計ジャッジ時間 21,193 ms
ジャッジサーバーID
(参考情報)
judge5 / judge4
このコードへのチャレンジ
(要ログイン)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 43 ms
54,992 KB
testcase_01 AC 42 ms
54,668 KB
testcase_02 AC 42 ms
54,004 KB
testcase_03 AC 43 ms
54,604 KB
testcase_04 AC 43 ms
54,752 KB
testcase_05 AC 44 ms
54,820 KB
testcase_06 AC 42 ms
54,236 KB
testcase_07 AC 42 ms
55,700 KB
testcase_08 AC 42 ms
55,264 KB
testcase_09 AC 42 ms
54,760 KB
testcase_10 AC 42 ms
54,680 KB
testcase_11 AC 42 ms
54,456 KB
testcase_12 AC 41 ms
55,620 KB
testcase_13 AC 42 ms
55,536 KB
testcase_14 AC 42 ms
54,040 KB
testcase_15 AC 44 ms
56,116 KB
testcase_16 AC 42 ms
54,876 KB
testcase_17 AC 42 ms
54,332 KB
testcase_18 AC 42 ms
54,588 KB
testcase_19 AC 44 ms
54,656 KB
testcase_20 AC 43 ms
55,260 KB
testcase_21 AC 42 ms
54,536 KB
testcase_22 AC 42 ms
55,544 KB
testcase_23 AC 43 ms
55,980 KB
testcase_24 AC 42 ms
56,192 KB
testcase_25 AC 43 ms
54,820 KB
testcase_26 AC 44 ms
55,340 KB
testcase_27 AC 43 ms
55,116 KB
testcase_28 AC 41 ms
55,060 KB
testcase_29 AC 42 ms
54,104 KB
testcase_30 AC 42 ms
55,316 KB
testcase_31 AC 42 ms
55,080 KB
testcase_32 AC 41 ms
55,052 KB
testcase_33 AC 42 ms
55,380 KB
testcase_34 AC 42 ms
54,872 KB
testcase_35 AC 42 ms
55,776 KB
testcase_36 AC 44 ms
54,528 KB
testcase_37 AC 43 ms
54,844 KB
testcase_38 AC 43 ms
55,520 KB
testcase_39 AC 41 ms
54,872 KB
testcase_40 AC 44 ms
55,324 KB
testcase_41 AC 43 ms
54,860 KB
testcase_42 AC 42 ms
55,444 KB
testcase_43 AC 58 ms
66,320 KB
testcase_44 AC 48 ms
61,672 KB
testcase_45 AC 50 ms
63,140 KB
testcase_46 AC 60 ms
66,436 KB
testcase_47 AC 49 ms
63,648 KB
testcase_48 AC 53 ms
64,300 KB
testcase_49 AC 44 ms
55,560 KB
testcase_50 AC 58 ms
66,264 KB
testcase_51 AC 60 ms
66,560 KB
testcase_52 AC 61 ms
67,012 KB
testcase_53 AC 59 ms
66,540 KB
testcase_54 AC 59 ms
67,644 KB
testcase_55 AC 60 ms
67,236 KB
testcase_56 AC 44 ms
54,824 KB
testcase_57 AC 54 ms
64,280 KB
testcase_58 AC 54 ms
63,852 KB
testcase_59 AC 43 ms
54,928 KB
testcase_60 AC 47 ms
61,276 KB
testcase_61 AC 57 ms
65,424 KB
testcase_62 AC 42 ms
54,864 KB
testcase_63 AC 94 ms
78,480 KB
testcase_64 AC 74 ms
74,392 KB
testcase_65 AC 88 ms
77,700 KB
testcase_66 AC 87 ms
77,292 KB
testcase_67 AC 73 ms
73,832 KB
testcase_68 AC 89 ms
78,120 KB
testcase_69 AC 91 ms
77,960 KB
testcase_70 AC 75 ms
75,252 KB
testcase_71 AC 71 ms
74,548 KB
testcase_72 AC 86 ms
78,072 KB
testcase_73 AC 84 ms
77,128 KB
testcase_74 AC 90 ms
78,104 KB
testcase_75 AC 82 ms
77,316 KB
testcase_76 AC 69 ms
72,008 KB
testcase_77 AC 86 ms
77,140 KB
testcase_78 AC 95 ms
78,272 KB
testcase_79 AC 89 ms
78,240 KB
testcase_80 AC 90 ms
77,944 KB
testcase_81 AC 90 ms
78,332 KB
testcase_82 AC 98 ms
78,380 KB
testcase_83 AC 239 ms
94,568 KB
testcase_84 AC 225 ms
93,424 KB
testcase_85 AC 150 ms
87,168 KB
testcase_86 AC 191 ms
91,496 KB
testcase_87 AC 215 ms
92,580 KB
testcase_88 AC 94 ms
79,396 KB
testcase_89 AC 237 ms
93,920 KB
testcase_90 AC 170 ms
87,592 KB
testcase_91 AC 153 ms
85,468 KB
testcase_92 AC 111 ms
80,504 KB
testcase_93 AC 201 ms
90,572 KB
testcase_94 AC 175 ms
89,252 KB
testcase_95 AC 174 ms
89,232 KB
testcase_96 AC 221 ms
92,988 KB
testcase_97 AC 129 ms
84,132 KB
testcase_98 AC 226 ms
93,060 KB
testcase_99 AC 166 ms
87,084 KB
testcase_100 AC 240 ms
94,288 KB
testcase_101 AC 113 ms
80,516 KB
testcase_102 AC 96 ms
79,288 KB
testcase_103 AC 108 ms
80,704 KB
testcase_104 AC 119 ms
81,220 KB
testcase_105 AC 212 ms
90,808 KB
testcase_106 AC 140 ms
84,980 KB
testcase_107 AC 213 ms
93,976 KB
testcase_108 AC 221 ms
93,620 KB
testcase_109 AC 179 ms
90,740 KB
testcase_110 AC 179 ms
89,420 KB
testcase_111 AC 196 ms
90,064 KB
testcase_112 AC 116 ms
81,380 KB
testcase_113 AC 175 ms
88,112 KB
testcase_114 AC 148 ms
84,784 KB
testcase_115 AC 97 ms
79,160 KB
testcase_116 AC 146 ms
85,880 KB
testcase_117 AC 117 ms
81,128 KB
testcase_118 AC 213 ms
92,920 KB
testcase_119 AC 152 ms
86,716 KB
testcase_120 AC 216 ms
92,376 KB
testcase_121 AC 111 ms
80,688 KB
testcase_122 AC 153 ms
85,724 KB
testcase_123 AC 43 ms
55,248 KB
testcase_124 AC 301 ms
105,076 KB
testcase_125 AC 271 ms
104,940 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

import sys
input = sys.stdin.readline
from collections import deque
class LowLink:
  def __init__(self, N, M):
    self.V = N
    self.E = M
    self.edge = [[] for _ in range(self.V)]
    self.edges = [0]*M
    self.visited = [False]*N
    self.parent = [N]*N
    self.order = [N]*N
    self.low = [N]*N
  
  def add_edges(self, ind=1):
    for i in range(self.E):
      a,b = map(int, input().split())
      a -= ind
      b -= ind
      self.edge[a].append(b)
      self.edge[b].append(a)
      self.edges[i] = (a,b)

  def add_edge(self, a, b):
    self.edge[a].append(b)
    self.edge[b].append(a)

  def low_link(self, start):
    self.start = start
    stack = deque([start])
    self.parent[start] = -1
    self.order[start] = 0
    self.cnts = [0]*self.V
    order = 1
    while stack:
      v = stack[-1]
      for u in self.edge[v]:
        if u==self.parent[v]:
          continue
        if self.order[u]<self.order[v]: #後退辺の処理
          self.low[v] = min(self.low[v], self.order[u])
        elif self.cnts[u]==0: #行きがけ
          self.order[u] = self.low[u] = order
          self.parent[u] = v
          self.cnts[u] += 1
          stack.append(u)
          order += 1
          break
        elif self.cnts[u]==1: #帰りがけ
          self.low[v] = min(self.low[v], self.low[u])
          self.cnts[u] += 1
      else:
        stack.pop() #帰り
    return
  
  def bridge(self):
    res = []
    for i,(a,b) in enumerate(self.edges):
      if self.order[a]>self.order[b]:
        a,b = b,a
      if self.low[b]<=self.order[a]:
        res.append(i+1)
    return res
  
  def articulation(self):
    res = []
    for v in range(self.V):
      cnt = 0
      for u in self.edge[v]:
        if self.parent[v]==u or self.parent[u]!=v:
          continue
        if self.order[v]<=self.low[u]:
          cnt += 1
      if v==self.start:
        if cnt>=2:
          res.append(v)
      elif cnt>=1:
          res.append(v)
    return res


N = int(input())
G = LowLink(N, N)
G.add_edges(1)
G.low_link(0)
ans = G.bridge()
print(len(ans))
print(*ans)
0